#include <opencv2/opencv.hpp>
#include <iostream>

using namespace std;
using namespace cv;
int main(int, char *argv[])
{
    Mat img_A(100,100,CV_8U,Scalar(255));
	cout<<"write img into /tmp/opencvimg.png\n";
    imwrite("/tmp/opencvimg.png", img_A);
    return 0;
}